Transformer Secondary Neutral Fusing

[Jsantangelo]

Is there ever a reason/need to fuse the grounded neutral of a transformer secondary? Would this actually be against code?

 

[wwhitney]

See 240.22, generally not allowed for actual fuses.

Cheers, Wayne

 

[Elect117]

Considering the neutral can only carry current seen on the phases, it is not plausible to need one.

The only thing I could think of would be overload protection if you only used one neutral for more than one single phase branch circuit. Like 1 neutral for 20 120V loads all on A phase and didn't size the neutral right.

But that is against the code. So that kind of defeats that purpose. I also don't see how you could fuse a neutral and still abide by 240.22.